This 2 hour-long guided project is part 2 of the project "Build a Google Firebase Web App". In this project, we focus on user authentication and data security rules. At the end of this course, you will be able to describe and apply Firebase user authentication and write data security rules to protect your Firebase data. This course requires basic experience with Firebase and intermediate to advance knowledge of JavaScript. Although it is not a prerequisite, I would strongly recommend you take part I of this class first if you have not already done so.